I almost did, but I didn&#39;t have a github account--which is a problem I should remedy anyway--and I didn&#39;t know whether bugs were happily accepted from new users (gumming the works with false reports).<br><br>I&#39;ll go ahead and signup then, and file it.<br>
<br>Thanks.<br><br><div class="gmail_quote">On Wed, Jan 4, 2012 at 8:13 AM, Thomas Kluyver <span dir="ltr">&lt;<a href="mailto:takowl@gmail.com">takowl@gmail.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi Brandon,<br><br>Thanks for reporting this. Could you make an issue for it at <a href="https://github.com/ipython/ipython/issues" target="_blank">https://github.com/ipython/ipython/issues</a> , so we keep track of it?<br>
<br>I don&#39;t think we&#39;ve got anyone regularly testing with Windows &amp; Python 3 together, so do let us know about other issues you encounter.<br>

Trying to launch the ipython-qtconsole.exe or ipython-qtconsole-script.pyw via pythonw on Python 3.2 immediately exits, and the Qt console never starts. Running with ipython-qtconsole-script.pyw with plain python.exe works fine (and consumes the console). Fortunately, redirection stdout and stderr allows to get the traceback (well, stderr is where it went), which yields the following:<br>

stdin = IOStream(sys.stdin)<br> File &quot;C:\Python32\lib\site-packages\IPython\utils\io.py&quot;, line 32, in __init__<br> raise ValueError(&quot;fallback required, but not specified&quot;)<br>ValueError: fallback required, but not specified<br>

<br>I was confused why nobody had seen this before, but come to find out it&#39;s a Python 3 vs 2 issue. sys.std* are now None for pythonw processes in Python 3.x, while they were file objects with fileno == -2 on Python 2.x. Regular old prints will work when stdout/stderr are None, but they just get discarded immediately, but of course any attribute lookups are going to fail.<br>

<br>This simple script run with pythonw (on v2 and v3) highlights the difference:<br># this will show what the std* file handles are on Python 2.x vs Python 3.x<br># noted @ <a href="http://bugs.python.org/issue1415" target="_blank">http://bugs.python.org/issue1415</a><br>